For long range it has to be .308. I have a 6.8 and love it. But finding anything but 115 grain ammo for the last year has been a pain in the ass. Even the tactical load 115 grain move at about 2600 fps. Not top notch for long range. If you could find the low weight ammo it would be perfect for long range but we all know the ammo issues we are currently going though.